Neck pillow



FIG. 1 is a front elevational view of a neck pillow showing my new design, wherein the rear elevational view is identical;

FIG. 2 is a right side elevational view of the neck pillow of FIG. 1, wherein the left side elevational view is identical;

FIG. 3 is a top plan view of the neck pillow of FIG. 1; and,

FIG. 4 is a bottom plan view of the neck pillow of FIG. 1. 

The ornamental design for a neck pillow, as shown and described. 